Unstable Mutation - Fourth Edition (Common)

Unstable Mutation is an Aura enchantment from Fourth Edition that grants the enchanted creature +3/+3 but adds a -1/-1 counter at the beginning of its controller's upkeep. This means you can give a creature a significant boost temporarily, but you'll need to be careful about when you use it, as the counters can quickly negate the initial advantage. It fits well in blue tempo decks that aim to apply pressure while managing board state. Available from Vault of Cards, a UK-based Magic: The Gathering store with fast delivery.